My friend upgraded his laptop to 100gig, and to return a couple favors he just gave me his old 40 gig drive for my ibook. I put in my panther CD and turn the laptop on. It will get to the apple screen with the little pinwheel at the bottom. THen the apple turns to a crossed out circle and stays there. Is this a problem with the CD or Harddrive? Or maybe its looking for the hard drive and won't boot because it can't find it.